An impressive opal and diamond brooch, early 20th century, claw-set with a large cabochon opal
An impressive opal and diamond brooch, early 20th century, claw-set with a large cabochon opal measuring approximately 33 x 27 x 5.3mm, within a foliate frame millegrain-set with single-cut diamonds, mounted in platinum, length 4.7cm, fitted case stamped SH&D Cass, Regent Street London